View Compilation Error

0_0_13158613_6221.cpp: In function 'bool check()':
0_0_13158613_6221.cpp:38:25: error: 'memset' was not declared in this scope
     memset(c,0,sizeof(c));
                         ^
0_0_13158613_6221.cpp: In function 'int main()':
0_0_13158613_6221.cpp:67:29: error: 'memset' was not declared in this scope
         memset(g,0,sizeof(g));
                             ^